JPH0379259A - Internal face polishing device - Google Patents

Abstract

PURPOSE:To increase a polishing quality and polishing efficiency by fixing an air cylinder for eccentricity holding in the state of being eccentric from the shaft center of a rocking drive shaft. CONSTITUTION:When a rocking drive shaft 14 is rotated and driven in the state of the rocking projector 10 of a main body being made eccentric by an air cylinder 19 for eccentricity, a whole main body 1 is rocked. Due to the rocking projector being positioned on the axial line of a polishing main shaft 8, the polishing main shaft performs precession by the rocking and a polishing tool 9 fitting to this front end performs a circular movement. The necessary polishing action becomes fulfilled with the polishing tool being slided and moved along the work internal periphery while its revolving at high speed, by positioning the grinding tool 9 inside a tubular work W1 after setting the size of this circular motion adequately and rotating and driving the polishing main shaft and rocking drive shaft. Because of the rocking projector being held in an eccentric state by the air cylinder 19, the contact pressure of the tool becomes uniform over the whole work internal peripheral based on the air elasticity of the air cylinder proper.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inner surface polishing apparatus suitable for polishing the inner surface of a tube, particularly for puff polishing the inner surface of a curved tube such as an elbow tube.

(Prior art and its problems) Conventionally, in the puff polishing of the inner surface of a curved pipe such as an elbow pipe, an operator holds the curved pipe in his hands and inserts a puff rotating at high speed in a fixed position into the curved pipe to polish the inner surface of the curved pipe. This pressing is performed by moving the curved pipe along its radius while maintaining the state.

However, with the above method, the polishing accuracy is greatly affected by the operator's hand movements and the amount of force applied, so the work requires a high level of skill and has the disadvantage that variations in finishing quality are unavoidable. There were also problems in terms of polishing efficiency and safety.

On the other hand, it is conceivable to introduce advanced work robots to deal with such problems, but the design and equipment, including the control mechanism, would require significant costs.

In view of the above-mentioned circumstances, the present invention has a simple device configuration.
It is an object of the present invention to provide an inner surface polishing device capable of stabilizing polishing quality, improving polishing efficiency, and safety in polishing the inner surface of a tube body, including puff polishing of the inner surface of a curved tube.

(Means for Solving the Problems) In order to achieve the above object, the internal polishing device of the present invention has the following features:
The main body of the polishing machine includes a spindle holder that rotatably holds a polishing spindle on which a polishing tool is attached to the front end, a polishing motor that rotationally drives the polishing spindle, and a swinging protrusion located at the rear on the axis of the polishing spindle. The main body is swingably supported in all directions by the mounting frame via a spherical pusher fitted in the spindle holder, and has an axis at the rear of the main body that passes through the center of swing of the main body. A swinging drive shaft and a motor for rotating the drive shaft are installed, and an eccentric air cylinder is fixed to the front end of the swinging drive shaft to hold the swinging protrusion eccentrically from the axis of the drive shaft. The present invention employs a structure in which a workpiece feed table is installed in front of the main body, and is equipped with a slider that supports a tubular work and is movable in the distance direction with respect to the main body.

Further, in the present invention, in the internal polishing apparatus, a mounting plate is fixed to the front end of the swinging drive shaft, and the mounting plate includes a guide for regulating the eccentric direction of the swinging protrusion in one direction, and a guide for regulating the eccentric direction of the swinging protrusion in one direction. The configuration according to claim (2), wherein an air cylinder and a return spring disposed opposite to the air cylinder to press the swing protrusion in a centripetal direction are attached, and the work feed table is perpendicular to the direction of movement thereof. The configuration of claim (3), which comprises a workpiece support plate rotatable about an axis, is cited as a preferred embodiment.

(Function) Since the main body of the polishing machine is supported by the mounting frame through the spherical bushing fitted in the spindle holder so as to be able to swing in all directions, the tS movement protrusion of the main body is moved by the eccentric air cylinder. When the swing drive shaft is rotated in an eccentric state,
The entire body swings.

Here, since the swinging protrusion is located on the axis of the polishing main shaft, the polishing main shaft precesses due to the above-mentioned swinging, and the polishing tool attached to the front end thereof moves in a circular motion. The magnitude of this circular motion, that is, the diameter, is determined by the distance of the swinging protrusion and polishing tool from the center of swing by the spherical push and the eccentricity of the swinging protrusion, so the degree of eccentricity is adjusted using the eccentric air cylinder. You can set it arbitrarily by doing this.

Therefore, after setting the magnitude of the circular motion appropriately, by positioning the polishing tool inside the tubular workpiece and rotating the polishing main shaft and the swinging drive shaft, the polishing tool rotates at high speed and rotates around the inner circumference of the workpiece. The required polishing action is achieved by slidingly moving along the .

Since the swing protrusion is held eccentrically by the air cylinder, the contact pressure of the tool becomes uniform over the entire inner circumference of the workpiece based on the air elasticity unique to the air cylinder, resulting in consistent polishing quality. It will be done.

According to the configuration in which an eccentric air cylinder, a return spring, and a guide are provided on the mounting plate at the front end of the swing drive shaft, the swing protrusion is constantly pressed against the round end of the cylinder by the spring, so that the protrusion is Eccentric positional displacement due to centrifugal force, vibration, and impact of the polishing member is prevented, and the precession of the polishing spindle becomes more stable.

If the workpiece is a straight pipe, if you place the workpiece on the workpiece feed stand so that its axis coincides with the central axis of the precession of the polishing spindle, you can move the workpiece feeder to move the workpiece inside surface. The entire surface can be polished uniformly (see Figure 6).

On the other hand, if the workpiece is a curved pipe, use a workpiece feed platform that has a workpiece support plate that rotates around an axis perpendicular to the direction of movement of the workpiece, and place the workpiece on the support plate so that its curvature is that of the support plate. The polishing start end of this workpiece is set at a position with a phase difference of 90'' with respect to the moving direction of the workpiece feeder, and as the polishing progresses, the All you have to do is rotate the support plate.

The polishing limit due to this rotating operation of the support plate is the position where the edge of the workpiece and the shaft of the tool interfere, but by gradually moving the workpiece feeder towards the swinging base side in conjunction with the rotating operation, the polishing The limit can be located closer to the inner part of the workpiece (see Figures 4 and 5), thus
After polishing from one end of the workpiece, the workpiece is replaced so that the positions of both ends are reversed and the same polishing is performed again, thereby uniformly polishing the entire inner surface.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is the main body of the polishing machine, 2 is a swinging device installed at the rear of the main body 1, and 3 is a workpiece feed table also installed at the front.

The polishing machine main body 1 includes a cylindrical main shaft holder 5 installed between both side walls 4a of a base frame 4 which is upwardly U-shaped in side view;
It includes a polishing motor 6 fixed to the lower surface of the bottom wall 4b of the base frame 4, and an L-shaped arm 7 extending rearward from the base frame 4. A polishing main shaft 8 is rotatably held in the main shaft holder 5 via bearings 5a, 5a. When the polishing motor 6 is driven, the pulleys 9a,
9b and (1) rotates via bells 1-9c. Further, at the tip of the L-shaped arm 7, a swinging protrusion 10 is fixedly provided so as to protrude rearward along the axis of the polishing main shaft 8, and a roller 10a is attached to the tip so as to freely rotate.

Reference numeral 11 denotes a vertical plate-shaped mounting frame, and the spindle holder 5 horizontally passes through a bearing Ila fixed to the mounting frame. The main shaft holder 5 is pivotally supported by the bearing lla via the spherical pusher 12, and thereby the main body 1 is supported by the mounting frame 11 so as to be swingable in all directions.

The rocking device 2 includes a rocking drive shaft 14 horizontally disposed via a pair of bearings 13a, 13a fixed on a horizontal plate-shaped mounting frame 13, and an L on the lower surface side of the mounting frame 13.
It has a motor 15 fixedly installed via a letter-shaped mounting bracket 13b, and when the motor 15 is driven, a swing drive shaft 14 is rotated via pulleys 16a, 16b and a timing belt 16c. . A disk 17 is fixed concentrically to the front end of the drive shaft 14,
As shown in FIG. 2, on the front surface of this disc 17, there is a radial guide groove 18 formed between a pair of angle members 18a, 18a that are fixedly installed opposite each other, and an L-shaped mounting piece 17a.
an eccentric air cylinder 19 that is fixedly installed through an eccentric air cylinder 19 with a rod 19a facing one side of the guide groove 18; and a mounting piece 17b.
A pressing pin 20 is held movably in the axial direction, is disposed to face the air cylinder 19 with the guide groove 18 in between, and is biased to protrude into the guide groove 18 by the bias of a coil spring 20a. is provided. 2
1 is a rotary joint for connecting a hose that supplies compressed air to the air cylinder 19.

Here, the swing drive shaft 14 is set so that its axis passes through the center of swing by the spherical pusher 12 of the main body l, and
The roller 10a of the tg moving projection 10 of the main body 1 is fitted into the guide groove 18 and is set to be sandwiched between the rod 19a of the air cylinder 19 and the pressing pin 20. Therefore, by driving the air cylinder 19 to extend,
As shown in FIG. 3, the swing protrusion 10 is eccentrically centered on the swing drive shaft 14 due to the pressure of the roller 10a by the rod 19a, and as a result, the entire main body 1 is moved toward the spherical bushing 3L.
It will be tilted around the swing center point 0 due to 12.

By rotating the rocking drive shaft 14 in the above-mentioned eccentric state, the roller 10a performs a circular motion, so that the polishing main shaft 8 of the main body l precesses, and the polishing tool 9 attached to the tip thereof Buff 9a revolves around in a circle.

As shown in FIG. 4, the workpiece feed table 3 has a slider 24 mounted on two guide rods 23 and 23 arranged on the base frame 22 and extending in the horizontal front-rear direction.
A vertical support shaft 25 is supported so as to be slidable in the front and rear directions via the shafts 24a and 24a, and has a disk-shaped workpiece support plate 25a fixed to the upper end thereof. There is. The work support plate 25a has a work support plate 26 on which a bent pipe work W1 such as an elbow pipe is placed.
The workpiece W1 is bolted at a position where the curvature of the workpiece W1 coincides with the circumference around the vertical support shaft 25. Reference numeral 26a designates a workpiece positioning piece having a 7-shaped recess provided upright on the plate 26. Therefore, when the workpiece support plate 25a of the workpiece feed table 3 is oriented so that the one end side of the workpiece Wl where polishing is to be started forms a phase difference of 90 degrees with respect to the moving direction of the slider 24, the workpiece support plate 25a is placed on the one end side of the workpiece W1. The polishing main shaft 8 is arranged so that its axis coincides with the center axis of the precession of the polishing main shaft 8.

In the surface polishing apparatus with the above configuration, the eccentric air cylinder 1
By adjusting the amount of eccentricity of the swinging protrusion 10 by 9, the outer diameter of the circular motion of the buff 9a caused by precession is set to be slightly larger than the inner diameter of the workpiece W1, and the slider 24 of the workpiece feed table 3 is adjusted as shown by the solid line in FIG. Move the workpiece W1 forward and position it so that the buff 9a enters the mouth edge of the workpiece W1, and then turn both motors 6.
15. As a result, the buff 9a rotates at high speed, and at the same time, buff polishing is performed while moving circularly along the inner circumference of the workpiece WI while contacting the workpiece WI with a constant pressure due to the precession of the polishing main shaft 8. After starting this polishing, by rotating the workpiece support league Fi25a counterclockwise as shown in Figure 5, the polishing position moves to the innermost side of the workpiece WI, as shown by the imaginary line in Figure 5. By gradually advancing the slider 24 along with this rotation operation, the interference position between the shaft portion of the tool 9 and the mouth edge of the workpiece W is shifted, and the workpiece W can be polished to the inner depths. It becomes possible. However, once the polishing of one end of the workpiece W is completed,
Place the workpiece WI on plate 2 so that both ends of the workpiece are reversed.
6 and perform the same operations as above to perform puff polishing on the unpolished portion on the opposite side.

In addition, since the roller 10a is pressed in the centripetal direction by the pressing pin 20, it does not deviate eccentrically even by centrifugal force accompanying the precession, vibrations due to polishing, impact, etc., and the precession is stabilized. Uniform polishing can be performed.

If the workpiece is a straight pipe, similar puff polishing can be performed by simply moving the slider 24 if the workpiece support plate 25a is made non-rotatable; however, for example, as shown in FIG. 26a may be used to place the straight pipe work W3 along the moving direction of the slider 24. Internal polishing over the entire length is possible without replacement.

In the above embodiment, the slider 24 of the work feed table 3.30 and the work support plate 25a are manually moved, but the slider 24 may be moved automatically by a fluid pressure cylinder or the like, or the work support The plate 25a may be rotationally driven by a motor or the like, and the amount of movement of the slider 24 is used to support the work when polishing the curved pipe work W.

It is also possible to perform automatic control according to the rotation of the temporary 25a.

In addition, the swinging protrusion 10 of the main body 1 is connected to the eccentric air cylinder 19.
It is also possible to omit the guide groove 18, coil spring 20a, and pressing pin 20 in connection with the rod 19a. However, in this case, the swinging protuberance lO may be displaced in the front-rear direction, and the protrusion 10 and the rod 1 may be displaced at the connecting portion.
A structure that allows angular displacement of 9a is required.

On the other hand, the internal surface polishing apparatus of the present invention is also applicable to various polishing methods other than the buffing described.

(Effects Unique to the Invention) According to the present invention, excellent polishing quality and high polishing efficiency can be achieved with an extremely hourly device configuration for polishing the inner surface of pipe bodies such as curved pipes, and the polishing work can be easily performed. An internal polishing device that can improve safety is provided.

Further, according to the structure of claim (2) of the present invention, the precession of the polishing main shaft is more stabilized, so that it is possible to perform more uniform internal polishing.

Furthermore, according to the structure of claim (3) of the present invention, it is possible to provide an inner surface polishing apparatus in which the feeding operation of the workpiece is easy and the polishing limit can be set at a deeper position inside the workpiece, especially when polishing the inner surface of a curved pipe.

[Brief explanation of drawings]

Fig. 1 is a side view of the entire internal surface polishing device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line shown in Fig. 1, and Part 3 is a schematic diagram explaining the operating principle of the same device. 4 is a plan view of the workpiece feeder of the same device as above, FIG. 5 is a cross-sectional plan view schematically explaining the workpiece feeding operation using the workpiece feeder, and FIG. 6 is a plan view of another workpiece feeder. It is a side view showing a configuration example. 1... Polishing machine main body, 3. 30... Work feed table, 5
... Spindle holder, 6... Polishing motor, 8...
Polishing main shaft, 9... Polishing tool, lO... Rocking protrusion,
11... Mounting frame, 12... Spherical push, 14
... Swing drive shaft, 15 ... Rotation drive motor, 1
7... Disc (mounting plate), 18... Guide groove, 19...
...Eccentric air cylinder, 20a...Coil spring (returning spring), 24...Slider, 25a...
- Work support plate, Wl. W2...Work.

Claims (3)

[Claims] (1) A spindle holder that rotatably holds a polishing spindle on which a polishing tool is attached to the front end of the polishing machine body, a polishing motor that rotationally drives the polishing spindle, and a swinging motor located at the rear on the axis of the polishing spindle. The main body is supported by the mounting frame through a spherical pusher fitted in the spindle holder so as to be able to swing in all directions. A swinging drive shaft having an axis passing through the swinging drive shaft and a rotational drive motor thereof are installed, and eccentric air is provided at the front end of the swinging drive shaft to hold the swinging protrusion eccentrically from the axis of the drive shaft. An internal polishing device, in which a cylinder is fixedly installed, and a workpiece feed table is installed in front of the main body, and includes a slider that supports a tubular work and is movable in a direction near and far relative to the main body. (2) A mounting plate is fixed to the front end of the swinging drive shaft, and the mounting plate includes a guide for regulating the eccentric direction of the swinging protrusion in one direction, the eccentric air cylinder, and the air cylinder. The internal surface polishing apparatus according to claim 1, further comprising a return spring disposed oppositely to each other to press the swinging protrusion in a centripetal direction. (3) The internal surface polishing apparatus according to claim 1 or 2, wherein the workpiece support plate is rotatable about an axis perpendicular to the moving direction of the workpiece support plate.